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On a new worksheet in the workbook, go to a cell and type a formula like =sum ('Y1:Y10'!B3). That indicates a SUM formula (adding things up) for all the sheets that are titled Y1 to Y10 (so 10 years' ...

It’s not uncommon for more casual iPad users to not aggressively update their iPadOS system software. Sure, Apple enables auto-update by default nowadays, but that feature can still be interrupted ...